全文获取类型
收费全文 | 326篇 |
免费 | 1篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 13篇 |
废物处理 | 28篇 |
环保管理 | 42篇 |
综合类 | 40篇 |
基础理论 | 80篇 |
环境理论 | 2篇 |
污染及防治 | 86篇 |
评价与监测 | 21篇 |
社会与环境 | 18篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 14篇 |
2016年 | 13篇 |
2015年 | 3篇 |
2014年 | 13篇 |
2013年 | 16篇 |
2012年 | 14篇 |
2011年 | 19篇 |
2010年 | 13篇 |
2009年 | 24篇 |
2008年 | 22篇 |
2007年 | 26篇 |
2006年 | 27篇 |
2005年 | 16篇 |
2004年 | 8篇 |
2003年 | 21篇 |
2002年 | 10篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 7篇 |
1998年 | 9篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1975年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有332条查询结果,搜索用时 500 毫秒
171.
Kathy?A.?TownsendEmail author Jens?Altvater Michael?C.?Thomas Qamar?A.?Schuyler Geoffrey?W.?Nette 《Marine Biology》2012,159(3):689-695
The blue-lined octopus Hapalochlaena fasciata contains the powerful neuromuscular blocker tetrodotoxin (TTX), which causes muscle weakness and respiratory failure. H. fasciata is regarded as one of the most venomous marine animals in the world, and multiple human fatalities have been attributed to
the octopus. To date, there have been no recorded incidents of an envenomation of a wild animal. Here, we present a newly
developed, multi-stage tandem mass spectrometry technique that provides unequivocal evidence for two cases of envenomation
of two ~110 kg herbivorous green sea turtles by two tiny cryptic blue-lined octopuses (~4 cm body length). These cases of
accidental ingestion provide evidence for the first time of the antipredator effect of TTX and highlight a previously unconsidered
threat to turtles grazing within seagrass beds. 相似文献
172.
Enrico Di Minin Christoph Fink Anna Hausmann Jens Kremer Ritwik Kulkarni 《Conservation biology》2021,35(2):437-446
Social media data are being increasingly used in conservation science to study human–nature interactions. User-generated content, such as images, video, text, and audio, and the associated metadata can be used to assess such interactions. A number of social media platforms provide free access to user-generated social media content. However, similar to any research involving people, scientific investigations based on social media data require compliance with highest standards of data privacy and data protection, even when data are publicly available. Should social media data be misused, the risks to individual users' privacy and well-being can be substantial. We investigated the legal basis for using social media data while ensuring data subjects’ rights through a case study based on the European Union's General Data Protection Regulation. The risks associated with using social media data in research include accidental and purposeful misidentification that has the potential to cause psychological or physical harm to an identified person. To collect, store, protect, share, and manage social media data in a way that prevents potential risks to users involved, one should minimize data, anonymize data, and follow strict data management procedure. Risk-based approaches, such as a data privacy impact assessment, can be used to identify and minimize privacy risks to social media users, to demonstrate accountability and to comply with data protection legislation. We recommend that conservation scientists carefully consider our recommendations in devising their research objectives so as to facilitate responsible use of social media data in conservation science research, for example, in conservation culturomics and investigations of illegal wildlife trade online. 相似文献
173.
The aim of the study was to determine the effect of aging of the herbicide isoproturon and its metabolites monodesmethyl-isoproturon and 4-isopropyl-aniline in agricultural soil on their availability to the degrading bacterium Sphingomonas sp. strain SRS2. The 14C-ring-labeled isoproturon, monodesmethyl-isoproturon, and 4-isopropyl-aniline were added to sterilized soil and stored for 1, 49, 71, or 131 d before inoculation with strain SRS2. The availability of the compounds was estimated from the initial mineralization and the amount of 14CO2 recovered after 120 d of incubation. Aging in soil for 131 d reduced the initial mineralization of isoproturon and monodesmethyl-isoproturon and, in the case of isoproturon, also reduced the recovery of 14CO2. Initial mineralization and recovery of 14CO2 from aged 4-isopropyl-aniline were slightly reduced, but less 14CO2 was generally produced than with isoproturon or monodesmethyl-isoproturon. Thus, recovery of 14CO2 from 14C-isoproturon and 14C-monodesmethyl-isoproturon was 50.7 to 64.4% of the initially added 14C, while recovery from 14C-4-isopropyl-aniline was only 11.7 to 17.0%. Sorption measurements revealed similar Freundlich constants (K(f)) for isoproturon and monodesmethyl-isoproturon, whereas K(f) for 4-isopropyl-aniline was more than fivefold greater. The findings imply that in soil, partial degradation of isoproturon to 4-isopropyl-aniline may lead to reduced mineralization of the herbicide due to sorption of the aniline moiety. 相似文献
174.
Vonne Lund Sven Hemlin James White 《Journal of Agricultural and Environmental Ethics》2004,17(2):157-179
A questionnaire study was performed among Swedish organic livestock farmers to determine their view of animal welfare and other ethical issues in animal production. The questionnaire was sent to 56.5% of the target group and the response rate was 75.6%. A principal components analysis (exploratory factor analysis) was performed to get a more manageable data set. A matrix of intercorrelations between all pairs of factors was computed. The factors were then entered into a series of multiple regression models to explain five dependent variables. Respondents were well educated and had long experience of farming. 81% were full-time farmers. They generally had a very positive attitude towards organic animal husbandry. They considered allowing animals their natural behavior a central aim, which is in accordance with organic philosophy. Farmers tended to be less approving of concepts like animal rights, dignity, and intrinsic value. When analyzing correlations between the factors, two groups of farmers emerged that were only partially correlated, representing different attitudes and behavioral dispositions. These may be interpreted as two subpopulations of organic livestock farmers in Sweden: those who saw organic farming as a lifestyle (``pioneer attitude') and entrepreneurs, who considered making money and new challenges more important. Their view of animal welfare differed. While the pioneers considered natural behavior a key issue, this was less important to the entrepreneurs, who also had a more approving attitude towards invasive operations such as castration and were more critical of the organic standards. 相似文献
175.
The major purpose of this paper is to explore the potential value of benefit–cost evaluation for stormwater quality management
decisions at a local level. A preliminary benefit–cost analysis (BCA) screening method is used for maximum extent practicable
(MEP) analysis, identifying promising management practices, and identifying societal and economic tradeoffs for local stormwater
problems. Ballona Creek, a major urban storm drain in Los Angeles, California, USA, is used to illustrate the practicality
of the benefit–cost evaluation. The Ballona Creek example demonstrates the economic limits of stormwater management in an
urban region and attests to the value of coordinated basinwide management compared to uncoordinated management by individual
landowners. Evaluation results suggest that in urban areas, the benefit of stormwater quality improvements might be far greater
if accompanied by comprehensive redesign of drainage networks and neighboring land uses. In this case, benefit–cost analysis
is found to be useful for evaluating and understanding stormwater management alternatives despite the uncertainties in characterizing
stormwater quality and the effects of stormwater management on improving receiving water quality. 相似文献
176.
Water input requirements of the rapidly shrinking Dead Sea 总被引:1,自引:0,他引:1
Shahrazad Abu Ghazleh Jens Hartmann Nils Jansen Stephan Kempe 《Die Naturwissenschaften》2009,96(5):637-643
The deepest point on Earth, the Dead Sea level, has been dropping alarmingly since 1978 by 0.7 m/a on average due to the accelerating
water consumption in the Jordan catchment and stood in 2008 at 420 m below sea level. In this study, a terrain model of the
surface area and water volume of the Dead Sea was developed from the Shuttle Radar Topography Mission data using ArcGIS. The
model shows that the lake shrinks on average by 4 km2/a in area and by 0.47 km3/a in volume, amounting to a cumulative loss of 14 km3 in the last 30 years. The receding level leaves almost annually erosional terraces, recorded here for the first time by Differential
Global Positioning System field surveys. The terrace altitudes were correlated among the different profiles and dated to specific
years of the lake level regression, illustrating the tight correlation between the morphology of the terrace sequence and
the receding lake level. Our volume-level model described here and previous work on groundwater inflow suggest that the projected
Dead Sea–Red Sea channel or the Mediterranean–Dead Sea channel must have a carrying capacity of >0.9 km3/a in order to slowly re-fill the lake to its former level and to create a sustainable system of electricity generation and
freshwater production by desalinization. Moreover, such a channel will maintain tourism and potash industry on both sides
of the Dead Sea and reduce the natural hazard caused by the recession. 相似文献
177.
Amine scrubbing is the most developed technology for carbon dioxide (CO2) capture. Degradation of amine solvents due to the presence of high levels of oxygen and other impurities in flue gas causes increasing costs and deterioration in long term performance, and therefore purification of the solvents is needed to overcome these problems. This review presents the reclaiming of amine solvents used for post combustion CO2 capture (PCC). Thermal reclaiming, ion exchange, and electrodialysis, although principally developed for sour gas sweetening, have also been tested for CO2 capture from flue gas. The three technologies all have their strengths and weaknesses, and further development is needed to reduce energy usage and costs. An expected future trend for amine reclamation is to focus on process integration of the current reclaiming technologies into the PCC process in order to drive down costs. 相似文献
178.
Are you interested in making the job of complying with federal environmental requirements cheaper and smarter for your business? The U.S. Environmental Protection Agency is committed to helping business and other sectors make more sense of environmental requirements through a number of innovative programs, one of the most far‐reaching being Project XL. © 2000 John Wiley & Sons, Inc. 相似文献
179.
Fu-Lin Evelyn Chu Eric D. Lund Paul R. Littreal Kate E. Ruck Ellen Harvey Jean-René Le Coz Yanic Marty Jeanne Moal Philippe Soudant 《Marine Biology》2008,156(2):155-169
The kinetics and efficiency of sterol production and bioconversion of phytosterols in two heterotrophic protists Oxyrrhis marina and Gyrodinium dominans were examined by feeding them two different algal species (Rhodomonas salina and Dunaliella tertiolecta) differing in sterol profiles. R. salina contains predominantly brassicasterol (?99%) and <2% cholesterol. The major sterols in D. tertiolecta are ergosterol (45–49%), 7-dehydroporiferasterol (29–31%) and fungisterol (21–26%). O. marina fed R. salina metabolized dietary brassicasterol to produce 22-dehydrocholesterol and cholesterol. O. marina fed D. tertiolecta metabolized dietary sterols to produce cholesterol, 22-dehydrocholesterol, brassicasterol and stigmasterol. G. dominans fed either R. salina or D. tertiolecta metabolized dietary sterols to make cholesterol, brassicasterol and a series of unknown sterols. When protists were fed R. salina, which contains cholesterol, the levels of cholesterol were increased to a magnitude of nearly 5- to 30-fold at the phytoplankton-heterotrophic protist interface, equivalent to a production of 172.5 ± 16.2 and 987.7 ± 377.7 ng cholesterol per mg R. salina carbon consumed by O. marina and G. dominans, respectively. When protists were fed D. tertiolecta, which contains no cholesterol, a net production of cholesterol by the protists ranged from 123.2 ± 30.6 to 871.8 ± 130.8 ng per mg algal C consumed. Cholesterol is not only the dominant sterol, but a critical precursor for many physiologically functional biochemicals in higher animal. As intermediates, these heterotrophic protists increase the amount of cholesterol at the phytoplankton–zooplankton interface available to higher trophic levels relative to zooplankton feeding on algae directly. 相似文献
180.
Velten Sarah Jager Nicolas W. Newig Jens 《Environment, Development and Sustainability》2021,23(10):14619-14641
Environment, Development and Sustainability - More and better collaboration between farmers and other stakeholders has repeatedly been identified as a key strategy for sustainable agriculture.... 相似文献